Nexus 2 USBL, 2782 Transceiver

Omni-Directional Transceiver for High Accuracy Subsea Positioning

This is a high-performance USBL system. It is the next generation of advanced USBL positioning and tracking system that incorporates Sigma 2 spread spectrum technology to provide a secure acoustic link. By incorporating aae Sigma 2 technology the wide bandwidth transmissions reduce its susceptibility to interference and enable precise, reliable positioning over an extended operational range.

applied acoustics

Great Yarmouth, GB

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Description

The Nexus 2 is the second generation of Easytrak digital USBL systems designed as a highly advanced positioning and tracking system that is quick to deploy and straightforward to operate. Featuring applied acoustics' Sigma 2 acoustic protocols, the Nexus 2’s digital spread spectrum transmissions provide a secure acoustic link with very low susceptibility to interference, enabling precise and reliable positioning over an extended operational range.

Able to determine the positions of up to 16 dynamic subsea targets simultaneously, Nexus 2 is ideal for many deep or shallow water applications where multiple assets are to be tracked. These operations can include UXO surveys utilising several magnetometers or sidescan sonars, diving operations, and for use at offshore worksites where several vehicles may be in use concurrently. The long range capability and exceptional accuracy specifications make Nexus 2 particularly effective for long layback towed applications.

When coupled with 1100, 1130, 1160, 1150 MF Series positioning beacons, Nexus 2 provides Multi-Firecommon interrogate and MiQ data telemetry functionality.

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Specifications

Transponders: Dimensions {mm}

74 x 395

Dry weight {kg}

3

Depth rating {m}

1500

Additional functions

Remote transponder option. Depth sensors. Modem. Omni-directional transponder type 1119 specification quoted. Directional transponders also available.

Physical properties of transducer head: Diameter [mm]

152

Height [m]

0.432

Min. external power [Voltage]

90

Max. external power [Voltage]

240

Max power consumption [W]

250

System Parameters: Frequency {kHz}

18-32

Spread spectrum technology

Y

Min. operation range {m}

1

Max. operation range {m}

2000

Operation beam angle {deg}

180

Angle accuracy (degr) @ 20 dB

0.25

Focussed beam forming

N

Number of active elements

8

Number of transponder channels

16

Multi user functionality

Y

LBL-functionality

N

Horizontal accuracy (in % of the water depth)

0.45

Vertical accuracy (in % of the water depth)

0.25

Motion compensation: Motion sensors compatible to the system:

Internal AHRS + external options. Internal depth sensor

Interfaces: Compatible hardware

Serial and Ethernet

Compatible software

Nexus 2

Real-time access procedure

Embedded Windows 7

Inertial interfacing

Y

Speed of sound: Ray tracing

N

Real-time integration of SV-profile

Y

Deployment: Inside deployment pole available

Y

Diam gate valve {mm}

300

Outside deployment pole available

Y

Recommended distance below keel {m}

2.5

Mounting and deployment: Mounting

Hull mounted & Portable

Retractable

Y

Used Sonar Methods: Type of system

USBL

More information: Distinguishable features

High accuracy/repeatability. Bi-directional Sigma 2 spread spectrum. Integrated 'Easycal 2', USBL calibration tool. Graphical overlay. Spec describes directional Transceiver Type 2686.. Directional transceiver option also available..